Weed upright to 50 cm high. Leaves 3.5 x 2.5 cm. Ovate, acuminate, cuneate opposite. Petiole 1 cm. Flowers in whorls on long narrow leafless spikes. Flowers blue small c. 2 mm long. Glandular hairy. leaves ± glabrous. Stems square, ridged, hairy on ridges.